import cv2
import mediapipe as mp
import time
import math


class handDetector():
    def __init__(self, mode=False, maxHands=2, detectionCon=0.5, trackCon=0.5):
        self.mode = mode
        self.maxHands = maxHands
        self.detectionCon = detectionCon
        self.trackCon = trackCon

        self.mpHands = mp.solutions.hands
        self.hands = self.mpHands.Hands(
            static_image_mode=self.mode,
            max_num_hands=self.maxHands,
            min_detection_confidence=self.detectionCon,
            min_tracking_confidence=self.trackCon
        )
        self.mpDraw = mp.solutions.drawing_utils
        self.handLmsStyle = self.mpDraw.DrawingSpec(color=(0, 0, 255), thickness=2)
        self.handConStyle = self.mpDraw.DrawingSpec(color=(0, 255, 0), thickness=3)
        self.tipIds = [4, 8, 12, 16, 20]

    def findHands(self, img, draw=True):
        imgRGB = cv2.cvtColor(img, cv2.COLOR_BGR2RGB)
        self.results = self.hands.process(imgRGB)
        if self.results.multi_hand_landmarks:
            for handLms in self.results.multi_hand_landmarks:
                if draw:
                    self.mpDraw.draw_landmarks(img, handLms, self.mpHands.HAND_CONNECTIONS, self.handLmsStyle, self.handConStyle)
        return img

    def findPosition(self, img, handNo=0, draw=True):
        self.lmList = []
        xList = []
        yList = []
        bbox = None

        if self.results.multi_hand_landmarks:
            myHand = self.results.multi_hand_landmarks[handNo]
            h, w, c = img.shape
            for id, lm in enumerate(myHand.landmark):
                cx, cy = int(lm.x * w), int(lm.y * h)
                self.lmList.append([id, cx, cy])
                xList.append(cx)
                yList.append(cy)
                if draw:
                    cv2.circle(img, (cx, cy), 5, (255, 0, 255), cv2.FILLED)

            if xList:  # 安全检查
                xmin, xmax = min(xList), max(xList)
                ymin, ymax = min(yList), max(yList)
                bbox = (xmin, ymin, xmax, ymax)
                if draw:
                    cv2.rectangle(img, (xmin - 20, ymin - 20), (xmax + 20, ymax + 20),
                                (0, 255, 0), 2)

        return self.lmList, bbox
    
    def fingersUp(self,thumbLeft = True):
        fingers = []
        # Thumb
        if thumbLeft:
            if self.lmList[self.tipIds[0]][1] < self.lmList[self.tipIds[0]-1][1]:
                fingers.append(1)
            else:
                fingers.append(0)
        else:
            if self.lmList[self.tipIds[0]][1] > self.lmList[self.tipIds[0]-1][1]:
                fingers.append(1)
            else:
                fingers.append(0)
        # 4 Fingers
        for id in self.tipIds[1:]:
            if self.lmList[id][2] < self.lmList[id-2][2]:
                fingers.append(1)
            else:
                fingers.append(0)
        # totalFingers = fingers.count(1)
        return fingers
    
    def findDistance(self, p1, p2, img, draw=True, r = 15, t = 3):
        x1, y1 = self.lmList[p1][1:]
        x2, y2 = self.lmList[p2][1:]
        cx, cy = (x1 + x2) // 2, (y1 + y2) // 2
        
        if draw:
            cv2.line(img, (x1, y1), (x2, y2), (255, 0, 255), t)
            cv2.circle(img, (x1, y1), r, (255, 0, 255), cv2.FILLED)
            cv2.circle(img, (x2, y2), r, (255, 0, 255), cv2.FILLED)
            cv2.circle(img, (cx, cy), r, (0, 0, 255), cv2.FILLED)
        length = math.hypot(x2 - x1, y2 - y1)
        return length, img, [x1, y1, x2, y2, cx, cy]
def main():
    pTime = 0
    cTime = 0
    cap = cv2.VideoCapture(0)
    detector = handDetector()
    while True:
        ret, img = cap.read()
        if ret:
            img = detector.findHands(img)
            lmList = detector.findPosition(img)
            if len(lmList) != 0:
                print(lmList[4])
            cTime = time.time()
            fps = 1/(cTime-pTime)
            pTime = cTime
            cv2.putText(img, f"FPS : {int(fps)}", (30, 50), cv2.FONT_HERSHEY_SIMPLEX, 1, (255, 0, 0), 3)
            cv2.imshow('img', img)
            if cv2.waitKey(1) == ord('q'):
                break
    cap.release()
    cv2.destroyAllWindows()
if __name__ == '__main__':
    main()